文章基本信息

标题：The tsunami source area of the 2003 Tokachi-oki earthquake estimated from tsunami travel times and its relationship to the 1952 Tokachi-oki earthquake
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作者：Kenji Hirata ; Yuichiro Tanioka ; Kenji Satake 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2014
卷号：56
期号：3
页码：367-372
DOI：10.1186/BF03353066
出版社：Springer Verlag
摘要：We estimate the tsunami source area of the 2003 Tokachi-oki earthquake (Mw 8.0) from observed tsunami travel times at 17 Japanese tide gauge stations. The estimated tsunami source area (∼ 1.4 × 10 4 km 2 ) coincides with the western-half of the ocean-bottom deformation area (∼2.52 × 10 4 km 2 ) of the 1952 Tokachi-oki earthquake (Mw 8.1), previously inferred from tsunami waveform inversion. This suggests that the 2003 event ruptured only the western-half of the 1952 rupture extent. Geographical distribution of the maximum tsunami heights in 2003 differs significantly from that of the 1952 tsunami, supporting this hypothesis. Analysis of first-peak tsunami travel times indicates that a major uplift of the ocean-bottom occurred approximately 30 km to the NNW of the mainshock epicenter, just above a major asperity inferred from seismic waveform inversion.
关键词：The 2003 Tokachi-oki earthquake; tsunami; tide gauge records; the 1952 Tokachi-oki earthquake